TypeError: Cannot read property 'getChildren' of undefined at /home/jeeplanet/node/app/helpers/FrontController.js:303:14 at callbacks (/home/jeeplanet/node/node_modules/express/lib/router/index.js:164:37) at /home/jeeplanet/node/app/controllers/product.js:41:18 at /home/jeeplanet/node/app/models/Category.js:160:11 at Promise. (/home/jeeplanet/node/app/models/Category.js:141:11) at Promise. (/home/jeeplanet/node/node_modules/mongoose/node_modules/mpromise/lib/promise.js:162:8) at emitOne (events.js:96:13) at Promise.emit (events.js:188:7) at Promise.emit (/home/jeeplanet/node/node_modules/mongoose/node_modules/mpromise/lib/promise.js:79:38) at Promise.fulfill (/home/jeeplanet/node/node_modules/mongoose/node_modules/mpromise/lib/promise.js:92:20)